CN214149151U - High-precision wide-range fiber grating displacement sensor - Google Patents
High-precision wide-range fiber grating displacement sensor Download PDFInfo
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- CN214149151U CN214149151U CN202022213048.4U CN202022213048U CN214149151U CN 214149151 U CN214149151 U CN 214149151U CN 202022213048 U CN202022213048 U CN 202022213048U CN 214149151 U CN214149151 U CN 214149151U
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Abstract
The utility model relates to a high-precision wide-range fiber grating displacement sensor, which comprises a first fiber grating, a second fiber grating, an extension spring, a sliding rod, a smooth track, a positioning sheet, a limiting structure, a transmission rod, a capillary steel pipe, a fiber loose sleeve and a protective shell; the transmission rod penetrates through the protective shell, and a limiting bolt is arranged at the left end of the transmission rod and is abutted against the outer side wall of the protective shell; the side wall of the transmission rod is fixedly connected with a sliding rod, and the other end of the sliding rod slides left and right in the smooth track; a limiting block is arranged in the smooth track and is the initial position of the sliding rod; the sliding rod is connected with the front end of the extension spring, and the rear end of the extension spring is connected with the positioning plate; the positioning sheet is adhered to the front end of the fiber bragg grating, a fiber loose sleeve is sleeved outside a tail fiber at the rear end of the fiber bragg grating, and the outer wall of the fiber loose sleeve is abutted to the inner wall of the capillary steel pipe; the capillary steel pipe is arranged on the protective shell in a penetrating way. This novel simple structure, measurement accuracy height, stability are good, sensitivity is high, anticorrosive, and suitability and expansibility are better.
Description
Technical Field
The utility model discloses based on the fiber grating technique, be a carry out real-time supervision's high accuracy wide range fiber grating displacement sensor to the structure, belong to optical fiber sensing technical field.
Background
As a novel sensing and monitoring sensing element, the fiber grating sensor has been widely applied to various civil engineering fields such as bridges and dams and applied to the structural health monitoring field due to its advantages of light weight, small size, high sensitivity, large dynamic monitoring range, strong anti-interference capability and the like. However, the test effect of the existing fiber grating sensor for measuring displacement is required to be improved, and the fiber grating sensor is not ideal in the aspects of displacement accuracy, precision, lag time and the like. In order to realize real-time monitoring of the structure and grasp the health condition of the structure, a high-precision wide-range fiber grating displacement sensor is developed, the displacement measurement function of a wide range can be realized, and the measurement result is more accurate and real.
SUMMERY OF THE UTILITY MODEL
In order to solve the problems in the prior art, the utility model relates to a high accuracy wide range fiber grating displacement sensor.
The utility model discloses a technical mode:
a high-precision wide-range fiber grating displacement sensor comprises a first fiber grating, a second fiber grating, a tension spring, a sliding rod, a smooth track, a positioning sheet, a limiting structure, a transmission rod, a capillary steel pipe, a fiber loose sleeve and a protective shell; the transmission rod penetrates through the protective shell, and a limiting bolt is arranged at the left end of the transmission rod and is abutted against the outer side wall of the protective shell; the side wall of the transmission rod is fixedly connected with a sliding rod, and the other end of the sliding rod slides left and right in the smooth track; a limiting block is arranged in the smooth track and is the initial position of the sliding rod; the sliding rod is connected with the front end of the extension spring, and the rear end of the extension spring is connected with the positioning plate; the positioning sheet is adhered to the front end of the fiber bragg grating, a fiber loose sleeve is sleeved outside a tail fiber at the rear end of the fiber bragg grating, and the outer wall of the fiber loose sleeve is abutted to the inner wall of the capillary steel pipe; the capillary steel pipe is arranged on the protective shell in a penetrating way.
The protective shell is also provided with a bare fiber grating, the tail fiber at the front end of the bare fiber grating is bonded with the inner wall of the protective shell, the tail fiber at the rear end of the fiber grating is sleeved with a fiber loose sleeve, and the outer wall of the fiber loose sleeve is abutted against the inner wall of the capillary steel pipe; the capillary steel pipe is arranged on the protective shell in a penetrating way.
The protective casing is made of a stainless steel and PVC mixed material.
The utility model has the advantages as follows:
1. the utility model discloses a direct atress of bare fiber grating, self produce and meet an emergency, and then make the central wavelength change the mode realize the monitoring of displacement, and do not paste fiber grating on the base member. Therefore, the deformation capacity of the fiber bragg grating is fully utilized, the monitoring sensitivity is improved, the initial deformation of the fiber bragg grating in the pasting process is avoided, and the monitoring precision of the sensor can be obviously improved.
2. The utility model discloses extension spring's initial condition makes fiber grating receive the pre-tension effect for pulling the state, when the transfer line produced the displacement, makes the spring take place to warp, continuously pulls, through spacer pulling fiber grating, and fiber grating is whole to be pulled, avoids the pressurized rupture.
3. The utility model discloses displacement sensor is inside to place wherein carrying out temperature compensation apart from the fiber grating who surveys the displacement in addition a bare fiber grating, has avoided because external environment temperature variation produces the influence and then leads to the error, is favorable to the long-term monitoring of implementation structure.
4. The utility model discloses a protective housing is 304 stainless steel and PVC mixed material, makes the sensor internal environment seal and stable, low in cost, simple manufacture, and stability is good, has good corrosion resistance, is difficult for receiving external disturbance and can play good guard action to the fiber grating.
5. The fiber grating displacement sensor has the advantages of simple structure, high measurement precision, good stability, easy processing and manufacturing, high sensitivity, electromagnetic interference resistance, corrosion resistance, and better applicability and expansibility.
Drawings
Fig. 1 is a schematic view of the overall joint of the present invention.
Fig. 2 is a three-dimensional cross-sectional view of the present invention.
Fig. 3 is an external perspective view of the present invention.
Detailed Description
An example of the apparatus is described in detail below with reference to figures 1-3 of the accompanying drawings:
a high-precision wide-range fiber grating displacement sensor comprises a first fiber grating 1, an extension spring 3, a sliding rod 4, a smooth track 5, a positioning sheet 6, a limiting structure 7, a transmission rod 8, a capillary steel pipe 9, a fiber loose sleeve 10 and a protective shell 11; the transmission rod 8 penetrates through the protective shell 11, and a limiting bolt is arranged at the left end of the transmission rod 8 and is abutted to the outer side wall of the protective shell 11; the side wall of the transmission rod 8 is fixedly connected with a sliding rod 4, and the other end of the sliding rod 4 slides left and right in the smooth track 5; a limiting block 7 is arranged in the smooth track 5, and the limiting block 7 is the initial position of the sliding rod 4; the slide rod 4 is connected with the front end of the extension spring 3, and the rear end of the extension spring 3 is connected with the positioning plate 6; the positioning sheet 6 is adhered to the front end of the fiber bragg grating 1, the fiber loose sleeve 10 is sleeved outside the tail fiber at the rear end of the fiber bragg grating 1, and the outer wall of the fiber loose sleeve 10 is abutted to the inner wall of the capillary steel pipe 9; the capillary steel pipe 9 penetrates through the protective shell 11.
The protective shell 11 is also provided with a second fiber bragg grating 2, the tail fiber at the front end of the second fiber bragg grating 2 is bonded with the inner wall of the protective shell 11, the tail fiber at the rear end of the second fiber bragg grating 2 is sleeved with a fiber loose sleeve 10, and the outer wall of the fiber loose sleeve 10 is abutted to the inner wall of the capillary steel pipe 9; the capillary steel pipe 9 penetrates through the protective shell 11.
The protective casing 11 is made of a mixed material of 304 stainless steel and PVC.
The fiber grating is a Bragg grating.
The extension spring, the sliding rod, the transmission rod and the positioning piece are all made of 304 stainless steel.
Furthermore, the bare fiber grating is directly stressed and generates strain, so that the displacement is monitored in a mode of changing the central wavelength, and the fiber grating is not adhered to the substrate. Therefore, the deformation capacity of the fiber bragg grating is fully utilized, the monitoring sensitivity is improved, the initial deformation of the fiber bragg grating in the pasting process is avoided, and the monitoring precision of the sensor can be obviously improved.
Furthermore, the initial state of the spring is in a tension state, so that the fiber bragg grating is under the action of pretension, when the transmission rod is displaced, the spring is deformed and continuously tensioned, the fiber bragg grating is pulled through the positioning piece, the fiber bragg grating is tensioned in the whole process, and the fiber bragg grating is prevented from being broken under pressure.
Furthermore, the protective casing is made of a mixed material of 304 stainless steel and PVC, so that the internal environment of the sensor is sealed and stable, the installation is simple, the use is convenient, the equipment cost is low, the stability is good, the corrosion resistance is good, and the fiber bragg grating can be well protected by being not easily subjected to external interference.
Furthermore, the relative displacement is converted into elastic force by adopting an extension spring and applied to the bare fiber grating, so that the fiber grating is axially deformed, and a central wavelength change signal is obtained. In this regard, the stiffness of the spring directly affects the amount of change in the center wavelength of the grating. By selecting springs with different stiffness, the measurement accuracy can be flexibly changed.
Furthermore, the displacement sensor is internally provided with a bare fiber grating for temperature compensation besides the fiber grating for measuring displacement, so that the influence caused by the temperature change of the external environment is avoided, and the error is avoided, and the long-term monitoring of the structure is favorably realized.
The specific installation process is as follows:
the transmission rod 8 is arranged in the center of the sensor, and the side wall of the transmission rod 8 is connected with the sliding rod 4; the sliding rod 4 moves on the smooth track 5, and the limiting structure 7 is adopted to fix the sliding rod 4 at the initial position; the slide rod 4 is connected with the front end of the extension spring 3, and the rear end of the extension spring 3 is connected with the positioning plate 6; the positioning sheet 6 is adhered to the tail fiber at the front end of the first fiber bragg grating 1, the optical fiber loose sleeve 10 is sleeved outside the tail fiber at the rear end of the first fiber bragg grating 1, and the outer wall of the optical fiber loose sleeve 10 is abutted to the inner wall of the capillary steel tube 9; a second fiber bragg grating 2 is placed on one side, a tail fiber at the front end is bonded with the platform, a fiber loose sleeve 10 is sleeved outside the tail fiber at the rear end of the second fiber bragg grating 2, and the outer wall of the fiber loose sleeve 10 is abutted to the inner wall of the capillary steel tube 9; the structure to be measured is connected with the front end of the transmission rod 7. And finishing component assembly.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and are not limited to the description, and although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention can be modified or replaced with equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the scope of the claims of the present invention.
Claims (2)
1. A high-precision wide-range fiber grating displacement sensor is characterized by comprising a first fiber grating, an extension spring, a sliding rod, a smooth track, a positioning sheet, a limiting structure, a transmission rod, a capillary steel pipe, a fiber loose sleeve and a protective shell; the transmission rod penetrates through the protective shell, and a limiting bolt is arranged at the left end of the transmission rod and is abutted against the outer side wall of the protective shell; the side wall of the transmission rod is fixedly connected with a sliding rod, and the other end of the sliding rod slides left and right in the smooth track; a limiting block is arranged in the smooth track and is the initial position of the sliding rod; the sliding rod is connected with the front end of the extension spring, and the rear end of the extension spring is connected with the positioning plate; the positioning sheet is adhered to the front end of the fiber bragg grating, a fiber loose sleeve is sleeved outside a tail fiber at the rear end of the fiber bragg grating, and the outer wall of the fiber loose sleeve is abutted to the inner wall of the capillary steel pipe; the capillary steel pipe is arranged on the protective shell in a penetrating way.
2. A high accuracy wide range fiber grating displacement sensor according to claim 1, wherein: the protective shell is also provided with a second fiber bragg grating, the tail fiber at the front end of the second fiber bragg grating is bonded with the inner wall of the protective shell, the tail fiber at the rear end of the second fiber bragg grating is sleeved with a fiber loose sleeve, and the outer wall of the fiber loose sleeve is abutted against the inner wall of the capillary steel pipe; the capillary steel pipe is arranged on the protective shell in a penetrating way.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022213048.4U CN214149151U (en) | 2020-10-07 | 2020-10-07 | High-precision wide-range fiber grating displacement sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022213048.4U CN214149151U (en) | 2020-10-07 | 2020-10-07 | High-precision wide-range fiber grating displacement sensor |
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| Publication Number | Publication Date |
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| CN214149151U true CN214149151U (en) | 2021-09-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202022213048.4U Active CN214149151U (en) | 2020-10-07 | 2020-10-07 | High-precision wide-range fiber grating displacement sensor |
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| CN (1) | CN214149151U (en) |
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